CN108992035A - The compensation method of blinkpunkt positional shift in a kind of tracking of eye movement - Google Patents
The compensation method of blinkpunkt positional shift in a kind of tracking of eye movement Download PDFInfo
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- CN108992035A CN108992035A CN201810583856.4A CN201810583856A CN108992035A CN 108992035 A CN108992035 A CN 108992035A CN 201810583856 A CN201810583856 A CN 201810583856A CN 108992035 A CN108992035 A CN 108992035A
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- A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions
- A61B3/113—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions for determining or recording eye movement
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- A61B5/16—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state
- A61B5/163—Devices for psychotechnics; Testing reaction times ; Devices for evaluating the psychological state by tracking eye movement, gaze, or pupil change
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Abstract
The compensation method of blinkpunkt positional shift, belongs to eye movement tracer technique field in a kind of tracking of eye movement.Subject's eyes are tested using eye tracker, the sample rate of eye tracker is set as 300~600HZ, and subject eyes remain unchanged at a distance from screen in experiment, which is 50~70cm；The data of left eye and right eye are recorded respectively, and record data are pupil diameter, blinkpunkt position abscissa value and ordinate value；Data during removing pan and blinking, obtain data available；It is averaged respectively by whole data availables to left eye and right eye, pupil size is mapped to bias size, just construct the shifts samples look-up table of corresponding single eyes, thus the very irregular offset characteristic of compensation.The method can significantly improve the accuracys for using eye movement follow-up mechanism the data obtained.
Description
Technical field
The invention belongs to eye movement tracer technique field, the compensation side of blinkpunkt positional shift in specially a kind of eye movement tracking
Method.
Background technique
Current eye movement follow-up mechanism (eye tracker), the overwhelming majority are to use various designs, such as head based on video system
It wears, tower installation, display installation etc., and has the product of various different models and technical specification.These devices all make every effort to improve
The accuracy of eye movement data.In fact, all eye movement follow-up mechanisms based on video, are dependent on same mechanism to track and record
Video image in human eye blinkpunkt, and calculated pupil center (i.e. blinkpunkt) is referred mainly to as eye gaze direction
Mark.The technology has been generally acknowledged that " true " optical axis of eyes is aligned with calculated pupil center, and the movement of pupil can be accurate
The movement of eyeball is indicated, it is hereby assumed that the position instruction of blinkpunkt direction of gaze.In fact, pupil size is to change
Variation, and the variation of pupil size may cause and generate offset between calculated blinkpunkt position and practical direction of gaze,
To reduce the accuracy of eye movement follow-up mechanism data.The main reason for pupil size changes is the brightness change in the visual field, bright
Degree variation may cause pupil and significantly expand or reduce in incubation period (130-500ms) relevant to movement.However, i.e.
Make always to control brightness within the scope of certain standard, also due to some other factor and lead to pupil dilation and contraction.This
Kind phenomenon may be related to experimental duties, such as general mental load, especially in human-computer interaction, it is also possible to appointing with experiment
It is engaged in unrelated, such as independent emotion processes.In addition, scene content also will affect the size of pupil.Cause pupil size variation not
With not necessarily related between reason, although all changes of pupil size are realized by the same kinematic system of human eye
's.
Summary of the invention
It is an object of the invention in order to solve the problems existing in the prior art, provide blinkpunkt position in a kind of tracking of eye movement
The compensation method of offset, to correct the offset of blinkpunkt position, to improve using the accurate of eye movement follow-up mechanism the data obtained
Property.
The purposes of eye tracker is that researcher is allowed to pass through the eye movement data obtained by its analysis record to inquire into eye movement and people
Relationship between psychological cognition activity.The purpose of the method for the present invention does not obtain medical diagnosis on disease result or health status, improves
Using the accuracy of eye movement follow-up mechanism the data obtained, therefore the method for the present invention is not belonging to patent statute and cannot be patented
The methods for the diagnosis of diseases of power.
The method of the present invention is LUT Method, and by being averaged to whole data availables, pupil size is mapped to partially
Size is moved, shifts samples look-up table is constructed, thus the very irregular offset characteristic of compensation.
The method of the present invention are as follows: 1, recorded respectively using left eye and right eye of the eye tracker to subject, record data are pupil
Diameter, blinkpunkt position abscissa value and ordinate value, the sample rate of eye tracker are set as 300~600HZ；Eye is tested in experiment
Eyeball remains unchanged at a distance from screen, which is 50~70cm；2, the continued eye of subject is allowed to watch the note of screen center attentively
Viewpoint, each test time are 8~12 seconds, residence time when during which screen intensity is black, are passed through by black gradually bleach
The time gone through, residence time when screen intensity is white, and be again respectively to test to continue by the white gradually blackening time experienced
The a quarter of time；5~15 above-mentioned tests are done in repetition；To each eye of subject, detection is corresponding one by one records number
According to, remove pan and blink during data, obtain 5~15 groups of data availables；By pupil diameter identical in each group data available
Corresponding blinkpunkt position abscissa value and ordinate value seek arithmetic mean of instantaneous value respectively, just obtain a series of straight with a certain pupil
The corresponding blinkpunkt position abscissa value of diameter and ordinate value, thus constitute the offset lookup table suitable for this；3, again
When secondary this eye tracker of use, pupil size P, blinkpunkt position abscissa value x, the ordinate value y of same subject eye are recorded
Get off, the pupil size P of same numerical value is then found in offset lookup table, blinkpunkt corresponding with P position abscissa in table
Value is exactly the horizontal offset x of blinkpunkt position, and ordinate value is exactly vertical offset y, compensated blinkpunkt position
Abscissa value is X- x, and abscissa value is Y- y.
Why say that blinkpunkt corresponding with P position abscissa value is exactly horizontal offset x in table, ordinate value is exactly
Vertical offset y is because during the experiment, subject eyes are look at always screen centre position, true blinkpunkt
Position is exactly origin, abscissa value 0, ordinate value 0.
The method of the present invention advanced optimized are as follows: the sample rate of eye tracker is set as 500HZ.Eyes and screen are tested in experiment
The distance of curtain remains 60cm.Each test time is 10 seconds.9 tests are done in repetition.
It is described to be recorded respectively using left eye and right eye of the eye tracker to subject, refer to two eyes while watching attentively,
Then record collects data respectively.
Beneficial effects of the present invention: the compensation method of blinkpunkt positional shift in a kind of tracking of eye movement is provided, can be compensated
Very irregular offset characteristic, significantly improves the accuracy using eye movement follow-up mechanism the data obtained.
Specific embodiment
See following embodiment:
1, the eye tracker model Eyelink 1000 used, Canadian SR-Research company production, display model
Samsung 22'LCD.Subject's eyes are tested using the eye tracker, the data that left eye and right eye obtain are remembered respectively
Record.Test data is the abscissa value x and ordinate value y of pupil diameter p, blinkpunkt position.The sample rate of eye tracker is set as
500HZ.It is tested eyes in experiment and remains 60cm at a distance from screen.2, subject's continued eye is allowed to watch the note of screen center attentively
Viewpoint, test is for 10 seconds altogether every time, and it is 2 seconds by black gradually bleach, screen intensity is that during which screen intensity, which is black stop 2 seconds,
It is white stop 2 seconds, then by white gradually blackening be 2 seconds.Nine above-mentioned tests are done in repetition, check the number that each eye is tested every time one by one
According to, remove the data during pan and blink, to the data available tested every time of this eyes.This eyes nine times are tested
In obtained data available, blinkpunkt position abscissa value x and ordinate value y corresponding with identical pupil diameter p seeks its arithmetic
Average value just obtains the abscissa value x and ordinate value y of blinkpunkt position corresponding with a certain pupil diameter p of this eyes, right
In the subject left eye of the present embodiment, such corresponding relationship shares 2047.Since during the experiment, subject eyes exist always
Watch screen centre position attentively, true blinkpunkt position is exactly origin position, abscissa value 0, ordinate value 0, therefore
Above-mentioned abscissa value x and ordinate value y is exactly the offset x and y of blinkpunkt position.Pair of 2047 p and x, y of left eye
It should be related to the offset lookup table for just constituting left eye.It is 10 row of head of the offset lookup table below, one shares 2047 rows.Pupil in table
The unit of numerical value is micron (mm).The first of offset is classified as the offset x of horizontal direction in table, and second is classified as vertical direction
Y is deviated, the unit for deviating numerical quantity is pixel (px).
After having the table, when reusing this eye tracker, by it is same subject left eye pupil size and blinkpunkt position (X,
Y it) records, then finds the pupil size of same numerical value in offset lookup table according to the size of pupil, with the pupil size
The horizontal and vertical offset (x, y) of corresponding blinkpunkt position can be found.Compensated blinkpunkt position is (X
- x, Y-y).Both horizontally and vertically offset is negative value in table, shows that blinkpunkt is deviated towards third quadrant.
Illustrated using the effect of the table: blinkpunkt position (- 5209, -7886) are after constructing above-mentioned offset lookup table, to make
With this eye tracker to a test data of same people's left eye, corresponding pupil size is 4870.Pass through offset lookup table
Compensation after, which should be (- 1275, -1527), horizontal and vertical offset be reduced to respectively compensation before
24.5% and 19.4%.On the whole, offset lookup table can reduce the offset of most of blinkpunkt position, and compensate effect
Fruit is preferable, and offset can averagely be reduced to 26.0% before compensation.
Claims (5)
1. the compensation method of blinkpunkt positional shift in a kind of eye movement tracking, it is characterised in that: (1) using eye tracker to subject
Left eye and right eye recorded respectively, record data be pupil diameter, blinkpunkt position abscissa value and ordinate value, eye movement
The sample rate of instrument is set as 300~600HZ；Eyes are tested in experiment to remain unchanged at a distance from screen, the distance for 50~
70cm；(2) continued eye of subject is allowed to watch the blinkpunkt of screen center attentively, each test time is 8~12 seconds, during which
Residence time when screen intensity is black, gradually bleached the time experienced by black, residence time when screen intensity is white, with
And again by the white gradually blackening time experienced be respectively test time a quarter；5~15 above-mentioned tests are done in repetition；
To each eye of subject, the corresponding record data of detection, the data during removing pan and blinking obtain 5~15 one by one
Group data available；By blinkpunkt position abscissa value corresponding to pupil diameter identical in each group data available and ordinate value point
Arithmetic mean of instantaneous value is not sought, just obtains a series of blinkpunkt corresponding with a certain pupil diameter position abscissa values and ordinate value,
Thus constitute the offset lookup table suitable for this eye；(3) when reusing this eye tracker, by the pupil of same subject eye
Hole size P, blinkpunkt position abscissa value x, ordinate value y are recorded, and same numerical value is then found in offset lookup table
Pupil size P, blinkpunkt corresponding with P position abscissa value is exactly the horizontal offset x of blinkpunkt position in table, indulges and sits
Scale value is exactly vertical offset y, and compensated blinkpunkt position abscissa value is X- x, and abscissa value is Y- y.
2. the compensation method of blinkpunkt positional shift in a kind of eye movement tracking as described in claim 1, it is characterised in that eye movement
The sample rate of instrument is set as 500HZ.
3. the compensation method of blinkpunkt positional shift in a kind of eye movement tracking as claimed in claim 2, it is characterised in that experiment
Middle subject eyes remain 60cm at a distance from screen.
4. the compensation method of blinkpunkt positional shift in a kind of eye movement tracking as claimed in claim 3, it is characterised in that every time
Test time is 10 seconds.
5. the compensation method of blinkpunkt positional shift in a kind of eye movement tracking as claimed in claim 4, it is characterised in that repeat
Do 9 tests.
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| CN111625090A (en) * | 2020-05-13 | 2020-09-04 | 闽江学院 | Comprehensive testing platform for large-range eye movement tracking and sight line estimation algorithm |
| CN112114657A (en) * | 2019-06-21 | 2020-12-22 | 北京七鑫易维科技有限公司 | Method and system for collecting information of fixation point |
| CN113040701A (en) * | 2021-03-11 | 2021-06-29 | 视微影像(河南)科技有限公司 | Three-dimensional eye movement tracking system and tracking method thereof |
| CN113534947A (en) * | 2020-04-21 | 2021-10-22 | 博泰车联网(南京)有限公司 | Eyeball tracking-based display backlight control method and equipment |
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